Bottom surface portion of a shoe outsole



FIG. 1 is a bottom plan view of a bottom surface portion of a shoe outsole showing my new design;

FIG. 2 is a front perspective view thereof; and,

FIG. 3 is a rear perspective view thereof.

The uneven broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a bottom surface portion of a shoe outsole, as shown and described. 